Pototan is the 24th largest municipality in the Province of Iloilo. Based on the data taken from the Department of Environment and Natural Resources (DENR), it has a total land area of 9, 710.1664 hectares.

The Municipality of Pototan is generally flat while some portions are hilly and rolling with the highest elevation of 30 to 50 meters above sea level. The dominant slope of the area ranges from 0-30% occupying an area of approximately 8,254.066 hectares while 1,456.599 hectares have slope of 3.1-5%.